From 15:00

At National University of Science and Technology MISiS, lecture hall Б-706 (7th floor)

MISiS, Leninskiy prospekt 4

Superconducting Metamaterials Laboratory / smm@misis.ru

The seminar “Pressure Tuning of Near Multiferroic Systems” organized by Superconducting Metamaterials Laboratory will be held in National University of Science and Technology MISIS (Moscow, Leninskiy prospekt 4), lecture hall Б-706 (7th floor) on 23rd of April at 15:00.

Speaker: David Matthew Jarvis (Quantum Matter Group, Cavendish Laboratory, Department of Physics, University of Cambridge)

Abstract:

The study of quantum phase transitions followed that of high temperature phase transitions in ordered systems. Initially studied in conducting systems, this revealed a great number of interesting effects, and the emergence of many novel behaviours such as unconventional superconductivity around a quantum critical point.

Due to the nature of many of these emergent phenomena to mask the quantum critical point in the temperature/tuning-parameter phase diagram, recent study has addressed quantum criticality in insulating systems, where the lack of free charge carriers is predicted to allow observation of the more fundamental behaviour of a quantum phase transition. This has been carried out in ferroelectric systems using pressure as a tuning mechanism to great effect.

A side of quantum criticality which has not yet been well studied is the behaviour of quantum critical points in systems with more than one coupled order parameter such as multiferroic materials. How criticality in the two coupled systems might interact has drawn recent interest and theoretical examination. For experimental observation, the first step will be identifying a system in which a quantum bicritical point may be approached.

Here we present measurement of the effect of mechanical pressure on the antiferromagnetic and quantum paraelectric systems in europium titanate, a system in which magnetism, electric ordering and lattice strain have previously been demonstrated to be strongly coupled. Magnetic entropy in the bulk system is seen to be reduced by the application of hydrostatic pressure and preliminary results of the effects of epitaxial pressure on the dielectric response of a thin film of europium titanate are also reported.
 

Language: English

Everyone is welcome!

Entrance for seminar participants who are not students, graduate students or employees of MISIS, will be carried out upon presentation of passport upon prior registration for the seminar.